It's like Windows Task Manager, except far more informative. The cramped multipane interface is very hard to read, but even it has its good points: it lists processes in a parent-child hierarchy, not a bad way to accidentally spot malware. It also lets you choose which columns of information to display, and it makes stopping or prioritizing processes as simple as a mouse click--a right-click, to be precise. It even lets you control which programs launch at start-up.

Looks aside, What's Running ought to appeal to system administrators, support specialists, and tech-savvy home users who want to know precisely what their computer is up to.